Derfflinger class upgunned, Germany Battlecruiser laid down 1914 (Engine 1911) Displacement: 29,292 t light; 31,014 t standard; 33,700 t normal; 35,849 t full load Dimensions: Length overall / water x beam x draught 696.85 ft / 690.29 ft x 95.14 ft (Bulges 100.07 ft) x 31.50 ft (normal load) 212.40 m / 210.40 m x 29.00 m (Bulges 30.50 m) x 9.60 m Armament: 8 - 16.93" / 430 mm guns (4x2 guns), 2,425.91lbs / 1,100.37kg shells, 1914 Model Breech loading guns in turrets (on barbettes) on centreline ends, evenly spread, 1 raised mount - superfiring 12 - 5.91" / 150 mm guns in single mounts, 102.98lbs / 46.71kg shells, 1914 Model Quick firing guns in casemate mounts on side, all amidships 4 - 3.46" / 88.0 mm guns in single mounts, 20.79lbs / 9.43kg shells, 1914 Model Anti-aircraft guns in deck mounts with hoists on side, all amidships, all raised mounts - superfiring Weight of broadside 20,726 lbs / 9,401 kg Shells per gun, main battery: 90 4 - 19.7" / 500 mm submerged torpedo tubes Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 11.8" / 300 mm 410.11 ft / 125.00 m 9.84 ft / 3.00 m Ends: 3.94" / 100 mm 131.23 ft / 40.00 m 9.84 ft / 3.00 m 148.95 ft / 45.40 m Unarmoured ends Upper: 9.06" / 230 mm 410.11 ft / 125.00 m 13.12 ft / 4.00 m Main Belt covers 91 % of normal length Main belt does not fully cover magazines and engineering spaces - Torpedo Bulkhead and Bulges: 1.77" / 45 mm 410.11 ft / 125.00 m 29.53 ft / 9.00 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 10.6" / 270 mm 3.15" / 80 mm 10.6" / 270 mm 2nd: 5.91" / 150 mm 1.97" / 50 mm 1.18" / 30 mm - Armour deck: 1.57" / 40 mm, Conning tower: 11.81" / 300 mm Machinery: Coal fired boilers, steam turbines, Direct drive, 4 shafts, 78,829 shp / 58,806 Kw = 26.00 kts Range 5,300nm at 14.00 kts Bunker at max displacement = 4,836 tons (100% coal) Complement: 1,243 - 1,616 Cost: £4.702 million / $18.806 million Distribution of weights at normal displacement: Armament: 2,591 tons, 7.7 % Armour: 9,366 tons, 27.8 % - Belts: 4,414 tons, 13.1 % - Torpedo bulkhead: 794 tons, 2.4 % - Armament: 2,567 tons, 7.6 % - Armour Deck: 1,326 tons, 3.9 % - Conning Tower: 265 tons, 0.8 % Machinery: 3,519 tons, 10.4 % Hull, fittings & equipment: 13,816 tons, 41.0 % Fuel, ammunition & stores: 4,408 tons, 13.1 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 33,288 lbs / 15,099 Kg = 13.7 x 16.9 " / 430 mm shells or 4.7 torpedoes Stability (Unstable if below 1.00): 1.10 Metacentric height 5.5 ft / 1.7 m Roll period: 17.9 seconds Steadiness - As gun platform (Average = 50 %): 60 % - Recoil effect (Restricted arc if above 1.00): 0.80 Seaboat quality (Average = 1.00): 1.21 Hull form characteristics: Hull has a flush deck Block coefficient: 0.542 Length to Beam Ratio: 6.90 : 1 'Natural speed' for length: 26.27 kts Power going to wave formation at top speed: 48 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): 0.00 degrees Stern overhang: 6.56 ft / 2.00 m Freeboard (% = measuring location as a percentage of overall length): - Stem: 29.53 ft / 9.00 m - Forecastle (20 %): 19.69 ft / 6.00 m - Mid (50 %): 19.69 ft / 6.00 m - Quarterdeck (15 %): 19.69 ft / 6.00 m - Stern: 19.69 ft / 6.00 m - Average freeboard: 20.47 ft / 6.24 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 118.0 % - Above water (accommodation/working, high = better): 137.3 % Waterplane Area: 45,500 Square feet or 4,227 Square metres Displacement factor (Displacement / loading): 91 % Structure weight / hull surface area: 209 lbs/sq ft or 1,020 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.96 - Longitudinal: 1.41 - Overall: 1.00 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is excellent Good seaboat, rides out heavy weather easily
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Saturday, December 30, 2006
What do you think of the Derfflinger with 8-17in guns?
I tried the upgunned Derfflinger with 6-17in guns, and the design seemed undergunned. I added bulges and used 8-17in guns, 12-5.9in QF guns, and 4-88mm AA guns (with 4-50cm torpedo tubes). The dimensions are: 690ft x 95ft (100ft bulges) x 31ft. The Standard displacement is 31,014 tons. The speed is 26 knots, with a range of 5300nm at 14 knots. The lower belt is 11.8in with an upper belt of 9in. The deck is just 1.57in. This is the Springsharp report:
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